The Korean diaspora consists of roughly seven million people, both descendants of early emigrants from the Korean peninsula, as well as more recent emigres from Korea. Nearly four-fifths of expatriate Koreans live in just three countries: China, the United States, and Japan.[1] Other countries with greater than 0.5% Korean minorities include Russia, Uzbekistan, Kazakhstan, Australia, Canada, and New Zealand. All these figures include both permanent migrants and sojourners.[4] If one focuses on long-term residents, there were about 5.3 million Korean emigrants as of 2010.

North Korea refers to Korean citizens living outside the Korean peninsula as haeoe gungmin (해외국민, "overseas citizens"), while South Korea uses the term jaeoe gungmin (재외국민, "citizens abroad").[5]

Another broader term is gyopo (교포, also spelled kyopo); however, the term has come to have negative connotations as referring to people who, as a result of living as sojourners outside the "home country", have lost touch with their Korean roots. As a result, others prefer to use the term dongpo (동포, roughly "brethren" or "people of the same ancestry"). Dongpo has a more transnational implication, emphasising links among various overseas Korean groups, while gyopo has more of a purely national connotation referring to the Korean state.[6][7]

Prior to the modern era, Korea had been a territorially stable polity for centuries; as Jaeeun Kim described it, "The congruence of territory, polity, and population was taken for granted".[8] Large-scale emigration from Korea began as early as the mid-1860s, mainly into the Russian Far East and Northeast China; these emigrants became the ancestors of the 2 million Koreans in China and several hundred thousand ethnic Koreans in Central Asia.[9][10]

Korea gained its independence after the Surrender of Japan in 1945 after World War II but was divided into North and South. After the establishment of the People's Republic of China in 1949, ethnic Koreans in China (Joseonjok or Chaoxianzu) became officially recognised as one of the 56 ethnic groups of the country. They are considered to be one of the "major minorities". Their population grew to about 2 million; they stayed mostly in northeastern China, where their ancestors had initially settled. Their largest population was concentrated in the Yanbian Korean Autonomous Prefecture in Jilin Province, where they numbered 854,000 in 1997.[10][16]

Korean emigration to the United States is known to have begun as early as 1903, but the Korean American community did not grow to a significant size until after the passage of the Immigration Reform Act of 1965.[17] Between 1.5 and 2 million Koreans now live in the United States, mostly in metropolitan areas.[1][18] A handful are descended from laborers who migrated to Hawaii in the late 19th and early 20th centuries. A significant number are descended from orphans of the Korean War, in which the United States was a major ally of South Korea and provided the bulk of the United Nations troops that served there. Thousands were adopted by American (mostly Caucasian) families in the years following the war, when their plight was covered on television. The vast majority, however, immigrated or are descended from those who immigrated after the Hart-Cellar Act of 1965 abolished national immigration quotas.

In the 1970s, however, Japan and the United States remained the top two destinations for South Korean emigrants, with each receiving more than a quarter of all emigration; the Middle East became the third most popular destination, with more than 800,000 Koreans going to Saudi Arabia between 1975 and 1985, and another 26,000 Koreans going to Iran. In contrast, aside from Germany (1.7% of all South Korean emigration in 1977) and Paraguay (1.0%), no European or Latin American destinations were even in the top ten for emigrants.[20] The cultural and stylistic diversity of the Korean diaspora is documented and celebrated in the work of fine-art photographer CYJO, in her Kyopo Project, a photograpic study of over 200 of people of Korean descent.

A substantial number of affluent Korean American professionals have settled in Bergen County since the early 2000s (decade) and have founded various academically and communally supportive organizations, including the Korean Parent Partnership Organization at the Bergen County Academiesmagnet high school[31] and The Korean-American Association of New Jersey.[32]Holy Name Medical Center in Teaneck, New Jersey, within Bergen County, has undertaken an ambitious effort to provide comprehensive health care services to underinsured and uninsured Korean patients from a wide area with its growing Korean Medical Program, drawing over 1,500 ethnic Korean patients to its annual health festival.[33][34][35][36] Bergen County's Broad Avenue Koreatown in Palisades Park[37] has emerged as a dominant nexus of Korean American culture,[38] has been referred to as a "Korean food walk of fame",[39] with diverse offerings,[38] incorporating the highest concentration of Korean restaurants within a one-mile radius in the United States,[40] and Broad Avenue has evolved into a Korean dessert destination as well;[41] and its Senior Citizens Center in Palisades Park provides a popular gathering place where even Korean grandmothers were noted to follow the dance trend of the worldwide viral hit Gangnam Style by South Korean "K-pop" rapper Psy in September 2012;[42] while the nearby Fort Lee Koreatown is also emerging as such. The Chusok Korean Thanksgiving harvest festival has become an annual tradition in Bergen County, attended by several tens of thousands.[43]

Bergen County's growing Korean community[44][45][46] was cited by county executive Kathleen Donovan in the context of Hackensack, New Jersey attorney Jae Y. Kim's appointment to Central Municipal Court judgeship in January 2011.[47] Subsequently in January 2012, New Jersey Governor Chris Christie nominated attorney Phillip Kwon of Bergen County for New Jersey Supreme Court justice,[48][49][50] although this nomination was rejected by the state's Senate Judiciary Committee,[51] and in July 2012, Kwon was appointed instead as deputy general counsel of the Port Authority of New York and New Jersey.[52] According to The Record of Bergen County, the U.S. Census Bureau has determined the county’s Korean American population – 2010 census figures put it at 56,773[53][54] (increasing to 63,247 by the 2011 American Community Survey)[28] - has grown enough to warrant language assistance during elections,[26] and Bergen County's Koreans have earned significant political respect.[55][56][57] As of May 2014, Korean Americans had garnered at least four borough council seats in Bergen County.[58] Described as a historic event, the US$6 million Korean Community Center opened in Tenafly, New Jersey in January 2015, aimed at integrating Bergen County's Korean community into the mainstream.[59]

With the development of the South Korean economy, the focus of emigration from Korea began to shift from developed nations towards developing nations, prior to repatriation back to Korea. With the 1992 normalisation of diplomatic relations between China and South Korea, many citizens of South Korea started to settle instead in China, attracted by business opportunities generated by the reform and opening up of China and the low cost of living. Large new communities of South Koreans have formed in Beijing, Shanghai, and Qingdao; as of 2006[update], their population is estimated to be between 300,000 and 400,000.[60] There is also a small community of Koreans in Hong Kong, mostly expatriate businessmen and their families; according to Hong Kong's 2001 census, they numbered roughly 5,200, making them the 12th-largest ethnic minority group.[61] Southeast Asia has also seen an influx of South Koreans. Koreans in Vietnam have grown in number to around 30,000 since the 1992 normalisation of diplomatic relations, making them Vietnam's second-largest foreign community after the Taiwanese.[62]Korean migration to the Philippines increased in the early 2000s due to the tropical climate and low cost of living compared to South Korea, although this diaspora has declined since 2010; 370,000 Koreans visited the country in 2004, and roughly 46,000 Korean expatriates live there permanently.[63] Though smaller, the number of Koreans in Cambodia has also grown rapidly, almost quadrupling between 2005 and 2009.[1] They mostly reside in Phnom Penh, with a smaller number in Siam Reap. They are largely investors involved in the construction industry, though there are also some missionaries and NGO workers.[64]

According to The Record, the Korean-American Association of New Jersey petitioned Bergen County school officials in 2013 to use textbooks that refer to the Sea of Japan as the East Sea as well.[72] In February 2014, Bergen County lawmakers announced legislative efforts to include the name East Sea in future New Jersey school textbooks.[73][74]

Koreans born or settled overseas have been migrating back to both North and South Korea ever since the restoration of Korean independence; perhaps the most famous example is Kim Jong-Il, born in Vyatskoye, Khabarovsk Krai, Russia, where his father Kim Il-sung had been serving in the Red Army.[76][77] Postwar migrations of Koreans from throughout the Japanese Empire back to the Korean peninsula were characterised both bureaucratically and popularly as "repatriation", a restoration of the congruence between the Korean population and its territory.[78] The pre-colonial Korean state had not clearly laid out the boundaries or criteria determining who was a citizen; however, the Japanese colonial government had registered all Koreans in a separate family registry, a separation which continued even if an individual Korean migrated to Manchuria or Japan; thus North and South Korea had a clear legal definition of who was a repatriating Korean, and did not have to create any special legal categories of national membership for them, the way Germany had done for post-World War II German expellees.[79]

The largest-scale repatriation activities took place in Japan, where Chongryon sponsored the return of Zainichi Korean residents to North Korea; beginning in the late 1950s and early 1960s, with a trickle of repatriates continuing until as late as 1984, nearly 90,000 Zainichi Koreans resettled in the reclusive communist state, though their ancestral homes were in South Korea. However, word of the difficult economic and political conditions filtered back to Japan, decreasing the popularity of this option. Around one hundred such repatriates are believed to have later escaped from North Korea; the most famous is Kang Chol-Hwan, who published a book about his experience, The Aquariums of Pyongyang.[80][81] South Korea, however, was a popular destination for Koreans who had settled in Manchukuo during the colonial period; returnees from Manchukuo such as Park Chung-hee and Chun Doo-hwan had a large influence on the process of nation-building in South Korea.[82]

Until the 1980s, Soviet Koreans did not repatriate in any large numbers and played little role in defining the boundaries of membership in the Korean nation.[83] However, roughly 1,000 Sakhalin Koreans are also estimated to have independently repatriated to the North in the decades after the end of World War II, when returning to their ancestral homes in the South was not an option due to the lack of Soviet relations with the South and Japan's refusal to grant them transit rights. In 1985, Japan began to fund the return of Sakhalin Koreans to South Korea; however, only an additional 1,500 took this offer, with the vast majority of the population remaining on the island of Sakhalin or moving to the Russian Far East instead.[84]

With the rise of the South Korean economy in the 1980s, economic motivations became increasingly prevalent in overseas Koreans' decisions of whether to repatriate and in which part of the peninsula to settle. 356,790 Chinese citizens have migrated to South Korea since the reform and opening up of China; almost two-thirds are estimated to be Chaoxianzu.[85] Similarly, some Koryo-saram from Central Asia have also moved to South Korea as guest workers, to take advantage of the high wages offered by the growing economy; remittances from South Korea to Uzbekistan, for example, were estimated to exceed USD100 million in 2005.[86] Return migration through arranged marriage is another option, portrayed in the 2005 South Korean filmWedding Campaign, directed by Hwang Byung-kook.[87] However, the Koryo-saram often face the most difficulty integrating into Korean society due to their poor command of the Korean language and the fact that their dialect, Koryo-mar, differs significantly from the Seoul dialect considered standard in the South.[86]

Return migration from the United States has been much less common than that from Japan or the former Soviet Union, as the economic push factor was far less than in 1960s Japan or post-Soviet collapse Central Asia. However, an increasing number of aspiring Korean American singers and actors, finding their career progress in Hollywood blocked, choose to go to South Korea through talent and modelling agencies; prominent examples include singer Brian Joo (of R&B duo Fly to the Sky) and actor Daniel Henney (who initially spoke no Korean).[88][89][90]